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Under the flux-weakening (FW) operation, the sensorless control of a five-phase flux-intensifying permanent magnet (FP-FIPM) motor faces the dilemma of reduced torque output and poor estimated accuracy caused by the serious space coupling between sensorless control and FW control. To overcome the abovementioned problems, a novel space decoupling sensorless control strategy for the FP-FIPM motor under FW operation is proposed in this article. Based on the decoupling model of the FP-FIPM motor, this article first proposes the dual space design to achieve the decoupling of sensorless control and FW control. For the FW control, an adaptive third-harmonic current injection strategy is proposed based on the fundamental space, which can effectively improve the torque output capability of the FP-FIPM motor. For the sensorless control, an adaptive frequency complex coefficient filter sliding mode observer (AFCCF-SMO) is developed based on the third-harmonic space, which can reduce complex disturbances and further improve the estimated rotor position accuracy. The feasibility of the proposed strategy is verified by experimental results.
Zhang et al. (Wed,) studied this question.